Clutch.



Patented July 4, 1899; E. S. CLARKE.

CLUTCH.

{Application filed May 26, 1898.)

(No Model) INVENTUH.

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WITNEEEEE= .11; ATTEIHNEYS.

U ITED STATES.

PATENT OFFICE.

EDWARD SUMMERFIEI D CLARKE, OF RICHMOND, VIRGINIA.

CLUTCH.

SPECIFICATION forming part of Letters Patent N 0. 628,390, dated July 4,1899.

Application filed May 26,1898.

To all whom it may concern:

Be it known that I, EDWARD SUMMERFIELD CLARKE, a citizen of the UnitedStates of America, and a resident of Richmond city, State of Virginia,have invented certain new and useful Improvements in Clutches, of

.machine; and-its object is to provide a device which shall be simple,strong, and durable and which shall be adapted to be so operated as tolimit the movement of the driven shaft to a single revolution. Devicesof this kind are used in connection with sawing-machines, stamping andpunching machines, &c.

In the accompanying drawings, which form a part of this specification,and'in which like figures represent like parts, Figure I shows a detailin perspective of the clutch. Fig. II shows in perspective the generalarrangement of the clutch and a part of the driven shaft.

Fig. 111 shows the same detail of the clutch.

as that shown in Fig. I, but in a different position.

In the drawings, 5 is a driven shaft to which an intermittent rotarymotion is to be given by means of the clutch and which is carried insuitable bearings, one of which is shown at 6 in Figs. I and III.Mounted loose on the shaft 5 is the spur-gear 10, which has attached toit the disk 9, having teeth 8. Pivoted in a slot in the shaft 5 is thepawl 7 having the ends 35 and 3!). Attached to the pawl 7, near its end35, is the spring 32, the other end of which is attached to the shaft 5.

28 is a lever pivoted at 29 and having at one end the inclined face 30.To the other end of the lever 28 is attached a rod 27, which may beoperated to lower that end of the lever to wvhich it is attached by handor by a t-readle.

The lever 28 is so arranged that its normal position is that shown inthe drawings. This may be Very simply effected by means of abalance-weight or a spring attached to the le ver itself, or to the rod27, or to the treadle.

The motive power is derived from a constantly-revolving shaft on whichis rigidly mounted a pinion.

This pinion (not shown in the drawings) is made to gear with the SerialNo. 681,785. (No model-l spur-gear 10, which is mounted loose on theshaft 5, thus giving to the said spur-gear 10, and consequently to thetoothed disk 9, a constant rotary motion. 3

The operation of the' clutch is as follows: The shaft 5 is at rest. Thespur-gear l and the toothed disk-9 are constantly revolving in thedirection indicated by the arrow. The lever 28 is in its normalposition. The end 35 of the pawl 7 is resting against the face 31 of thelever 28. The spring 32 is in tension 7 into gear with the teeth 8 ofthe disk 9. To set the shaft in motion, the operator depresses the rod27 thereby raising that end of the lever 28 which has the inclined face30 .and so freeing the pawl 7. The spring 32 acting on the pawl 7 throwsits end 36 into gear with the teeth 8 of the disk 9, which beingattached to the constantly-revolving gear causes the pawl 7 and theshaft 5 to revolve in the direction indicated by the arrow. (See Fig.II.) Fig. III shows the pawl 7 and the shaft 5 nearing the end of arevolution. As the end 35 of the pawl 7 comes down it strikes on thesloping face of the lever 28, which has returned to its normal positionafter the removal of the pressure on the rod 27 or other means by whichthelever 28 may be operated, and continuing to come down the said end ofthe pawl 72 slides down the inclined face 30 of the lever 28, and isconsequently forced to one side until it reaches the face 31 of the saidlever .28, by which time the end 36 of the said pawl 7 has been drawnout of gear with the teeth 8 of the toothed disk 9. In order to preventthe pawl 7 and the shaft 5 from continuing from their momentum torevolve and so pass the point at which they are shown in Fig. I, afriction-brake is used, consisting of a shoe 34, a set-screw 37, held ina bracket 33, which is attached to any convenient point, such as thebearing 0. By adjusting the set-screw 37 the shoe 34 can be caused tobear with more or less pressure upon the shaft 5. The use of any form ofbrake will be unnecessary with those machines in which the stored-upenergy of the moving parts is insufiicient to overcome there's tance ofthe machine.

' of my improved clutch can 9; instead of the pawl 7 and is tending topull the end 36 of thepawl another toothed section toengage with thetoothed disk 9. This toothed section Would be arranged to slide on afeather attached to the shaft and would be forced into engagement withthe toothed disk 9 by means of a compression-spring. From this toothedsection there-would project a pin, which would strike against theinclined face of the lever 28 at the end of each revolution of theclutch is that it can be made to transmit a constant motion or anintermittent motion to the shaft 5 at the will of the operator. 'If itbe desired to cause the clutch to transmit a constant motion totheshaft'5, the operator by depressing the rod 27 raises that end ofthe. lever 28 which has the inclined face 30 so high that the end of thepawl 7will when it comes down altogether miss the end of the leverES-that is to say, he raises the end of the lever 28 out of the path ofthe pawl 7.

\Vhen he desires to stop the machine;

he simply allows the lever 28 to resume its normal position.

Having now described my inventi'on, wha't I claim, and desire tosecnreby Letters Patent of the United-States, is In a clutch, the combinationof ashaft, a spring-actuated dog or' pawl pivotally attached to theshaft and adapted to engage projections on a driving member, asprin'gtoforce the dog or pawl into engagement with the projections on thedriving member, a driving member vhaving projections adaptedtoengage'thedog or pawl to drive the shaft, a lever having aninclined face adaptedto withdraw the dog or pawl from engagement with the projections. on thedriving member at the end of each revolution ofthe said driving vmember, and having another face to hold the .dog or pawl out ofengagement with the pro.- jections on the driving member at the end ofeach revolution of the said driving member;

Signed by me atvRichm'ond city this -23d day of May, 1898. I i EDWARDSUMMERFIELD CLARKE.

Witnesses: V J HENRY E. BASKEWILL, ARTHU'R SoRIvnNoR;

